<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .a{
            width:300px;
            height:30px;
        }
            #b{
                width:500px;
                border:0px solid red;
                text-align:right;
            }
        #submitButton{
        width:200px;
        height:30px;
        background-color:#1C86EE;
        border:0px ;

}
    a{
        TEXT-DECORATION:none
        }
    </style>
</head>
<body>
<div id = "b">
<form>
用户名 <input type = "text" name = "username" class = "a"><br><br>
手机号 <input type = "text" name = "phone_number" class = "a"><br><br>
密码 <input type = "password" name = "pwd" class = "a"><br><br>
验证码 <input type = "text" name = "yzm"  size="22" style="height:30px ">&nbsp;<button style="height:30px ">获取短信验证码</button><br><br>
    <input type = "checkbox"><font size="1">阅读并接受<a href = "###">《百度用户协议》</a>及<a href = "###">《百度隐私权声明》</a></font><br><br>
<input type = "submit" id='submitButton' >
</form>
</div>
</body>
</html>